<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 、卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false">
            </el-alert>
            <!-- 选择商品区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类</span>
                    <!-- 选择商品分类的级联选择 -->
                    <el-cascader expend-trigger="hover" v-model="selectedCateKeys" :options="catelist"
                        :props="cateProps" @change="handlehCanged" clearable></el-cascader>
                </el-col>
            </el-row>
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">
                        添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTabData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hansleClose(i,scope.row)">{{ item }}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New Tag
                                </el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                    @click="showeditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                    @click="removeById(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">
                        添加属性
                    </el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTabData" border stripe>
                        <el-table-column type="index"></el-table-column>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hansleClose(i,scope.row)">{{ item }}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New Tag
                                </el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                    @click="showeditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                    @click="removeById(scope.row.attr_id)">删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加属性的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addCateDialogClose">
            <el-form :model="addForm" status-icon :rules="addFormRules" ref="addFormRef" label-width="100px"
                class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editCateDialogClose">
            <el-form :model="editForm" status-icon :rules="addFormRules" ref="editFormRef" label-width="100px"
                class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定的数组
            selectedCateKeys: [],
            activeName: 'many',
            // 动态参数的数据
            manyTabData: [],
            // 静态参数的数据
            onlyTabData: [],
            // 控制添加属性对话框的显示与隐藏
            addDialogVisible: false,
            addForm: {
                attr_name: ''
            },
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' },

                ]
            },
            // 修改参数列表
            editForm: {},
            // 控制修改参数的对话框
            editDialogVisible: false,
            // 控制安妮与文本框的显示
            // inputVisible:false,
            // // 文本框中输入的内容
            // inputValue:''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get("categories")
            if (res.meta.status !== 200) {
                return this.$message.error("获取商品列表失败")
            }
            // this.$message.success("获取商品列表成功")
            this.catelist = res.data
            // console.log(res);
        },
        // 级联选择框选项变化，会触发这个函数
        async handlehCanged() {
            this.getParamsData()
        },
        // tab页签点击事件处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
            // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTabData = []
                this.onlyTabData=[]
                return
            }
            // 证明选中的是三级分类
            // console.log(this.selectedCateKeys);
            // 根据所选分类的id，和当初所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            })
            if (res.meta.status !== 200) {
                return this.$message.error("获取参数列表失败")
            }
            // console.log(res);
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ?
                    item.attr_vals = item.attr_vals.split(" ") : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框输入的值
                item.inputValue = ''
            })
            if (this.activeName === 'many') {
                this.manyTabData = res.data
            } else {
                this.onlyTabData = res.data
            }
            // console.log(this.activeName);
        },
        // 添加属性或是参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) {
                    return this.$message.error("添加参数失败")
                }
                this.$message.success("添加参数成功")
                this.getParamsData()
                this.addDialogVisible = false
            })
            this.addDialogVisible = true
        },
        // 监听对话框事件，重置表单数据
        addCateDialogClose() {
            this.$refs.addFormRef.resetFields()
        },
        // 监听对话框事件，事件表单数据重置
        editCateDialogClose() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击编辑按钮，显示出对话框
        async showeditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
            if (res.meta.status !== 200) {
                return this.$message.error("修改数据失败")
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 点击确定，关闭对话框
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
                if (res.meta.status !== 200) {
                    return this.$message.error("修改数据失败")
                }
                this.$message.success("修改数据成功")
                this.getParamsData()
                this.editDialogVisible = false
            })

        },
        // 删除
        async removeById(attr_id) {
            const confirResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if (confirResult !== 'confirm') {
                return this.$message.info("已取消删除")
            }
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            // console.log(res);
            if (res.meta.status !== 200) {
                return this.$message.error("删除数据失败")
            }
            this.$message.success("删除数据成功")
            this.getParamsData()
        },
        // 文本框失去了焦点或者是按下了enter都会触发
        async handleInputConfirm(row) {
            // trim()去除字符串两端的空白字符
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return则证明的呼入的内容 需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
           this.saveAttrVals(row)
        },
        // 将对attr_vals的操作，保存到数据库
        async saveAttrVals(row){
            // 需要发起请求，保存数据
            const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error("修改参数项失败")
            }
            this.$message.success("修改参数项成功")
        },
        showInput(row) {
            row.inputVisible = true
            // 当页面元素被刷新之后调用这个函数
            // 自动获得焦点
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        hansleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }

    },
    computed: {
        // 如果按钮需要被禁用，则返回true 否则返回false
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的分类的Id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 计算添加属性与参数的显示
        titleText() {
            if (this.activeName == 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }


}
</script>

<style scoped lang="less">
.cat_opt {
    margin: 15px 0
}

.el-tag {
    margin: 10px;
}

.input-new-tag {
    width: 120px;
}
</style>